<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>同步代码和异步代码</title>
</head>

<body>
    <button class="btn">点我</button>
    <script>
        // 目标：阅读并回答代码执行和打印的顺序
        const result = 0 + 1
        console.log(result)
        setTimeout(() => {
            console.log(2)
        }, 2000)
        document.querySelector('.btn').addEventListener('click', () => {
            console.log(3)
        })
        document.body.style.backgroundColor = 'pink'
        console.log(4)
    </script>
</body>

</html>